【正确答案】 D

【答案解析】短语辨析。leave off中断，停止，如：Since I took up exercise，I've left off medicine．自从开始锻炼以来我就不再吃药了。leave sth．over推迟某事，如；These matters will have to be left over until the next meeting．这些事情只好等到下次会议再讨论了。leave behind忘了带，遗留，如：Jefferson left behind a rich legacy of ideas to his countrymen．杰弗逊给他的人民留下了一笔丰富的思想遗产。leave out忽略，遗漏，如：He has left out an important fact．他忽略了一个重要事实。根据句意，D最合适。